County Route S12 (California)

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County Route S12

Palomar Airport Rd/San Marcos Blvd/Twin Oaks Valley Rd/Deer Springs Rd
Length	15.51 miles
Direction	West/East
From	Carlsbad Blvd in Carlsbad
Major junctions	Interstate 5 in Carlsbad El Camino Real in Carlsbad Rancho Santa Fe Rd in San Marcos SR 78 in San Marcos
To	Interstate 15 near Hidden Meadows
Major cities	Carlsbad, San Marcos
Established	1961
System	California County Routes

County Route S12, also known as Palomar Airport Road, San Marcos Boulevard, Twin Oaks Valley Road, and Deer Springs Road, runs through North County in San Diego.

[edit] Route description

S12's western terminus is at Carlsbad Blvd in Carlsbad. Almost immediately after it begins, S12 (this portion of which is called "Palomar Airport Rd") intersects with Interstate 5. It continues eastward, passing its namesake, McClellan-Palomar Airport. It intersects with El Camino Real and eventually enters San Marcos, where it is renamed San Marcos Blvd after an intersection with Business Park Dr. San Marcos Blvd intersects Rancho Santa Fe Rd and continues eastward, crossing State Route 78. Shortly thereafter, San Marcos Blvd intersects with Twin Oaks Valley Road, which bears the S12 designation after this junction. Shortly after becoming S12, Twin Oaks Valley Rd passes over Mission Rd (County Route S14) without actually intersecting it, then continues to the northern borders of San Marcos. Curiously, at the edge of the city, the road's name changes to Deer Springs Rd at an intersection with another Twin Oaks Valley Rd. Deer Springs Rd continues northward through unincorporated land. Eventually the road turns east, and S12 ends at an interchange with Interstate 15, though the road itself continues as Mountain Meadow Rd through Hidden Meadows.